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Android圆形进度条

移动端开发_小黑 人气:0

这几天有在学习Jetpack中CameraX的内容，在拍摄视频的时候想着做一个自定义带有进度条的可长按控件，用来显示拍摄进度，故记录下来与大家分享！效果如下：

(篇幅过长是因为有代码解析过程，可直接到最后查看完整代码)

这个控件较为简易，从效果中可以看出，控件模拟了单击拍照，长按可以录制视频的功能，中途松手或者时间到都可以停止录制

思路很简单，使用简单的画笔工具就可以完成这个控件

以上就是全部的思路了，代码拆解如下：

（一）继承自View并实现构造方法，代码如下：

public class LongClickView extends View {
    public int DEFAULT_MAX_SECONDS = 15;
    public int DEFAULT_ANNULUS_WIDTH = 5;
    public int DEFAULT_ANNULUS_COLOR;
    public int DEFAULT_RATE = 50;
    private Paint mSmallCirclePaint;
    private Paint mMiddenCirclePaint;
    private Paint mBigCirclePaint;
    private Paint mAngleCirclePaint;
    private int mWidthSize;
    private Timer mTimer;//计时器
    private AtomicInteger mCount = new AtomicInteger(0);
    private MyClickListener mMyClickListener;
    private boolean mIsFinish = true;
    private long mStartTime;//点击的时间
    private long mEndTime;//点击结束的时间
    private int mMaxSeconds;
    private int mDelayMilliseconds;
    private int mAnnulusColor;
    private float mAnnulusWidth;

    public interface MyClickListener {
        void longClickFinish();//长按结束

        void singleClickFinish();//单击结束
    }

    public void setMyClickListener(MyClickListener myClickListener) {
        mMyClickListener = myClickListener;
    }

    public LongClickView(Context context) {
        this(context, null);
    }

    public LongClickView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public LongClickView(Context context, @Nullable AttributeSet attrs, int defStyleAttr)                 {
        super(context, attrs, defStyleAttr);
        getAttrs(context, attrs);
        initView();
    }
}

（二）定义并获取自定义属性，属性以及获取属性代码如下：

attr_long_click_view.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="LongClickView">
        <attr name="maxSeconds" format="integer" />
        <attr name="annulusWidth" format="integer" />
        <attr name="annulusColor" format="color" />
        <attr name="delayMilliseconds" format="integer" />
    </declare-styleable>
</resources>
 private void getAttrs(Context context, @Nullable AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.LongClickView);
        //maxSeconds 最大的秒数
        mMaxSeconds = typedArray.getInt(R.styleable.LongClickView_maxSeconds, DEFAULT_MAX_SECONDS);
        //annulusWidth 圆环的宽度
        mAnnulusWidth = typedArray.getInt(R.styleable.LongClickView_annulusWidth, DEFAULT_ANNULUS_WIDTH);
        //annulusColor 圆环的颜色
        DEFAULT_ANNULUS_COLOR = context.getResources().getColor(R.color.color_grey);
        mAnnulusColor = typedArray.getColor(R.styleable.LongClickView_annulusColor, DEFAULT_ANNULUS_COLOR);
        //delayMilliseconds 进度条隔多少时间走一次,值越小走的越快，显得更流畅
        mDelayMilliseconds = typedArray.getInt(R.styleable.LongClickView_delayMilliseconds, DEFAULT_RATE);
    }

(三)定义画笔工具 的代码如下:

    private void initView() {
        mBigCirclePaint = new Paint();
        mSmallCirclePaint = new Paint();
        mMiddenCirclePaint = new Paint();
        mAngleCirclePaint = new Paint();
        mBigCirclePaint.setStyle(Paint.Style.FILL);
        mBigCirclePaint.setColor(Color.LTGRAY);
        mBigCirclePaint.setAntiAlias(true);
        mBigCirclePaint.setStrokeWidth(5);
        mSmallCirclePaint.setStrokeWidth(5);
        mSmallCirclePaint.setAntiAlias(true);
        mSmallCirclePaint.setColor(Color.WHITE);
        mSmallCirclePaint.setStyle(Paint.Style.FILL);

        mMiddenCirclePaint.setStrokeWidth(5);
        mMiddenCirclePaint.setAntiAlias(true);
        mMiddenCirclePaint.setColor(Color.LTGRAY);
        mMiddenCirclePaint.setStyle(Paint.Style.FILL);
        mAngleCirclePaint.setStrokeWidth(5);
        mAngleCirclePaint.setAntiAlias(true);
        mAngleCirclePaint.setColor(mAnnulusColor);
        mAngleCirclePaint.setStyle(Paint.Style.FILL);
        ...//这里是长按监听

    }

(四)onMeasure中测量大小，onDraw中绘制圆与扇形，代码如下：

onMeasure中，如果没有定义实际宽高就会使用父组件的宽高，如果有实际宽高便会使用自己的宽高

 @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mWidthSize = MeasureSpec.getSize(widthMeasureSpec);
        setMeasuredDimension(mWidthSize, mWidthSize);
    }

onDraw中，一共有三层圆形填充绘制以及一层扇形填充绘制，先绘制最外层的灰色圆形，再根据此时的进度绘制一定角度的扇形，然后覆盖一层灰色的圆形，最后在覆盖上一层白色的中心圆，并且在绘制过程以及绘制结束时的中心圆半径不同。代码如下：

 @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2, mBigCirclePaint);//最外层的填充圆
        RectF rectF = new RectF(0, 0, mWidthSize, mWidthSize);//进度扇形
        if (mCount.get() > 0) {
            //求出每一次定时器执行所绘制的扇形度数
            float perAngle = 360f / mMaxSeconds / (1000f / mDelayMilliseconds);
            canvas.drawArc(rectF, 0, perAngle * mCount.get(), true, mAngleCirclePaint);
        }
        canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mMiddenCirclePaint);//中间一层灰色的圆
        //最后绘制中心圆
        if (mIsFinish) {
            canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mSmallCirclePaint);
        } else {
            canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 8, mSmallCirclePaint);
        }
        super.onDraw(canvas);
    }

（五）监听长按监听开始定时器并刷新画布，监听触摸事件进行结束的回调，定时器使用的是Timer类，当时间超过自定义的最大秒数时就会自动停止，并定时刷新画布,代码如下:

        this.setOnLongClickListener(new OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                mIsFinish = false;
                mCount.set(0);
                mTimer = new Timer();
                mTimer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        mCount.addAndGet(1);
                        invalidate();
                        if (mCount.get() * mDelayMilliseconds >= mMaxSeconds * 1000) {
                            mCount.set(0);
                            this.cancel();
                            invalidate();
                            mIsFinish = true;
                            if (mMyClickListener != null) {
                                mMyClickListener.longClickFinish();
                            }
                        }
                    }
                }, 0, mDelayMilliseconds);
                return true;
            }
        });
 @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            mEndTime = System.currentTimeMillis();
            new MyAsyncTask().execute();
        } else if (event.getAction() == MotionEvent.ACTION_DOWN) {
            mStartTime = System.currentTimeMillis();
        }
        return super.onTouchEvent(event);
    }

将定时器停止与停止后的判断逻辑放在AsyncTask中编写，确保定时器不会继续处理逻辑之后再做判断

    public class MyAsyncTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... voids) {
            if (mTimer != null) {
                mTimer.cancel();
            }
            return null;
        }
        @Override
        protected void onPostExecute(Void aVoid) {
            //使用时间戳的差来判断是单击或者长按
            if (mEndTime - mStartTime > 1000) {
                //防止在自动结束后松开手指又重新调用了一次长按结束的回调
                if (!mIsFinish) {
                    if (mMyClickListener != null) {
                        mMyClickListener.longClickFinish();
                    }
                }
            } else {
                //若是单击就清除进度条
                mCount.set(0);
                invalidate();
                if (mMyClickListener != null) {
                    mMyClickListener.singleClickFinish();
                }
            }
            mIsFinish = true;
        }
    }

 

结束后的回调类代码如下:

   public interface MyClickListener {
        void longClickFinish();//长按结束

        void singleClickFinish();//单击结束
    }

最后，完整的代码如下，自定义属性上方有贴出来代码：

public class LongClickView extends View {
    public int DEFAULT_MAX_SECONDS = 15;
    public int DEFAULT_ANNULUS_WIDTH = 5;
    public int DEFAULT_ANNULUS_COLOR;
    public int DEFAULT_RATE = 50;
    private Paint mSmallCirclePaint;
    private Paint mMiddenCirclePaint;
    private Paint mBigCirclePaint;
    private Paint mAngleCirclePaint;
    private int mWidthSize;
    private Timer mTimer;//计时器
    private AtomicInteger mCount = new AtomicInteger(0);
    private MyClickListener mMyClickListener;
    private boolean mIsFinish = true;
    private long mStartTime;//点击的时间
    private long mEndTime;//点击结束的时间
    private int mMaxSeconds;
    private int mDelayMilliseconds;
    private int mAnnulusColor;
    private float mAnnulusWidth;
    public interface MyClickListener {
        void longClickFinish();//长按结束
        void singleClickFinish();//单击结束
    }
    public void setMyClickListener(MyClickListener myClickListener) {
        mMyClickListener = myClickListener;
    }
    public LongClickView(Context context) {
        this(context, null);
    }
    public LongClickView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public LongClickView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        getAttrs(context, attrs);
        initView();
    }
    private void getAttrs(Context context, @Nullable AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.LongClickView);
        //maxSeconds 最大的秒数
        mMaxSeconds = typedArray.getInt(R.styleable.LongClickView_maxSeconds, DEFAULT_MAX_SECONDS);
        //annulusWidth 圆环的宽度
        mAnnulusWidth = typedArray.getInt(R.styleable.LongClickView_annulusWidth, DEFAULT_ANNULUS_WIDTH);
        //annulusColor 圆环的颜色
        DEFAULT_ANNULUS_COLOR = context.getResources().getColor(R.color.color_grey);
        mAnnulusColor = typedArray.getColor(R.styleable.LongClickView_annulusColor, DEFAULT_ANNULUS_COLOR);
        //delayMilliseconds 进度条隔多少时间走一次,值越小走的越快，显得更流畅
        mDelayMilliseconds = typedArray.getInt(R.styleable.LongClickView_delayMilliseconds, DEFAULT_RATE);
    }
    private static final String TAG = "LongClickView";
    private void initView() {
        mBigCirclePaint = new Paint();
        mSmallCirclePaint = new Paint();
        mMiddenCirclePaint = new Paint();
        mAngleCirclePaint = new Paint();
        mBigCirclePaint.setStyle(Paint.Style.FILL);
        mBigCirclePaint.setColor(Color.LTGRAY);
        mBigCirclePaint.setAntiAlias(true);
        mBigCirclePaint.setStrokeWidth(5);
        mSmallCirclePaint.setStrokeWidth(5);
        mSmallCirclePaint.setAntiAlias(true);
        mSmallCirclePaint.setColor(Color.WHITE);
        mSmallCirclePaint.setStyle(Paint.Style.FILL);
        mMiddenCirclePaint.setStrokeWidth(5);
        mMiddenCirclePaint.setAntiAlias(true);
        mMiddenCirclePaint.setColor(Color.LTGRAY);
        mMiddenCirclePaint.setStyle(Paint.Style.FILL);
        mAngleCirclePaint.setStrokeWidth(5);
        mAngleCirclePaint.setAntiAlias(true);
        mAngleCirclePaint.setColor(mAnnulusColor);
        mAngleCirclePaint.setStyle(Paint.Style.FILL);
        this.setOnLongClickListener(new OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                mIsFinish = false;
                mCount.set(0);
                mTimer = new Timer();
                mTimer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        mCount.addAndGet(1);
                        invalidate();
                        if (mCount.get() * mDelayMilliseconds >= mMaxSeconds * 1000) {
                            mCount.set(0);
                            this.cancel();
                            invalidate();
                            mIsFinish = true;
                            if (mMyClickListener != null) {
                                mMyClickListener.longClickFinish();
                            }
                        }
                    }
                }, 0, mDelayMilliseconds);
                return true;
            }
        });
    }
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mWidthSize = MeasureSpec.getSize(widthMeasureSpec);
        setMeasuredDimension(mWidthSize, mWidthSize);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2, mBigCirclePaint);//最外层的填充圆
        RectF rectF = new RectF(0, 0, mWidthSize, mWidthSize);//进度扇形
        if (mCount.get() > 0) {
            //求出每一次定时器执行所绘制的扇形度数
            float perAngle = 360f / mMaxSeconds / (1000f / mDelayMilliseconds);
            canvas.drawArc(rectF, 0, perAngle * mCount.get(), true, mAngleCirclePaint);
        }
        canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mMiddenCirclePaint);//中间一层灰色的圆
        //最后绘制中心圆
        if (mIsFinish) {
            canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mSmallCirclePaint);
        } else {
            canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 8, mSmallCirclePaint);
        }
        super.onDraw(canvas);
    }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP) {
            mEndTime = System.currentTimeMillis();
            new MyAsyncTask().execute();
        } else if (event.getAction() == MotionEvent.ACTION_DOWN) {
            mStartTime = System.currentTimeMillis();
        }
        return super.onTouchEvent(event);
    }
    public class MyAsyncTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... voids) {
            if (mTimer != null) {
                mTimer.cancel();
            }
            return null;
        }
        @Override
        protected void onPostExecute(Void aVoid) {
            //使用时间戳的差来判断是单击或者长按
            if (mEndTime - mStartTime > 1000) {
                //防止在结束后松开手指有重新调用了一次长按结束的回调
                if (!mIsFinish) {
                    if (mMyClickListener != null) {
                        mMyClickListener.longClickFinish();
                    }
                }
            } else {
                mCount.set(0);
                invalidate();
                if (mMyClickListener != null) {
                    mMyClickListener.singleClickFinish();
                }
            }
            mIsFinish = true;
        }
    }
}

使用的代码如下：

activity_long_click_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <com.example.customerview.long_click_view.LongClickView
        android:id="@+id/long_click_view"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        app:annulusColor="@color/color_2196F3"
        app:annulusWidth="20"
        app:delayMilliseconds="40"
        app:maxSeconds="4" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:text="长按录制视频，单击拍照"
        android:textColor="@color/colorBlack"
        android:textSize="20dp" />
</LinearLayout>

LongClickViewActivity.java

        mLongClickView.setMyClickListener(new LongClickView.MyClickListener() {
            @Override
            public void longClickFinish() {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(LongClickViewActivity.this, "长按结束", Toast.LENGTH_SHORT).show();
                    }
                });
            }

            @Override
            public void singleClickFinish() {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(LongClickViewActivity.this, "单击结束", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });

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